Information Technology Reference
In-Depth Information
35.
B. SIP is defined is RFC 2453 and is used to establish, maintain, and terminate calls.
36.
D. MGCP is used to control gateways.
37.
D. Storage services provide capture and storage of media streams.
38.
C. Bridging services provide transcoding and recording services of media streams.
39.
D. Multimedia conferencing should be provisioned on DSCP AF4 PHB.
40.
F. OA M s h o u l d b e p r o v i s i o n e d o n D S C P C S 2 P H B .
41.
D. Real-time interactive media should be provisioned on DSCP CS4 PHB.
42.
D. G.729 generates an 8-kbps bit rate.
43.
A. G.711 generates a 64-kbps bit rate.
44.
C. LLQ is recommended for most VoIP networks.
45.
A. Cisco TelePresence 3000 generates 12.3Mbps worth of traffic at 1080p.
46.
D. Cisco Video Advantage generates 768 kbps worth of CIF traffic.
47.
Multisite WAN with centralized call processing with a CM cluster at the main site and
SRST routers at the remote sites.
48.
SRST enables the remote routers to provide call-handling support for IP phones when
they lose connectivity to the CallManagers because of a WAN failure.
49.
LLQ provides a strict queue for RTP (VoIP) traffic and differentiated class of service
for all other t raffic.
50.
The minimum bandwidth is approximately 640 kbps. Each call is 30 kbps times four,
which equals 120 kbps. The exiting 512 kbps of data traffic equals 640 kbps. The cir-
cuit should be provisioned at a higher speed to prevent the sustained peak utilization
from being higher than 70 percent.
51.
Ye s , a C U C M c l u s t e r s h o u l d b e i m p l e m e n t e d a t t h e m a i n s i t e .
52.
cRTP compresses the RTP/UDP/IP headers from 40 bytes to 2 to 4 bytes.
53.
FRF.12 is the link and fragmentation technique used in Frame Relay networks.
Chapter 15
“Do I Know This Already?” Quiz
1.
C. SNMPv3 introduces authentication and encryption for SNMP.
2.
B. SNMP runs over UDP.
3.
A. Managed devices contain SNMP agents.
4.
D. A MIB is a collection of information that is stored on the local agent of the man-
aged device.
